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• Passive Scan using wpa_supplicant-0.7.3

  - by Ashish Yadav

  I am using wpa_supplicant-0.7.3 and WL12xx TI Driver(WiFi) . Looking into both code,I seen that both support passive scan . Also, nl80211 driver is used (not wext). I am not able to find any command for passive scan in wpa_cli . With iw , for passive scan we can use : iw dev wlan0 scan passive Similar I want to do passive scan using wpa_supplicant . So need help to know how to do passive scan using wpa_supplicant?

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• GNU screen - Unable to reattach to screen after lost connection

  - by subhashish

  I was using irssi in screen but lost connection. After I ssh'd back in to the server, I can no longer attach to that screen. screen -ls shows that the screen is already attached. I tried screen -D to force detach it, and it said detach but screen -ls still says it's attached. I tried screen -x and it just hangs there. [sub@server ~]$ screen -ls There are screens on: 4033.poe (Detached) 7728.irssi (Attached) 2 Sockets in /var/run/screen/S-sub. What can I do now?

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• How to keep variable preserve while running script through ssh

  - by Ali Raza

  I am trying to run while loop with read through ssh: #!/bin/bash ssh [email protected] "cat /var/log/syncer/rm_filesystem.log | while read path; do stat -c \"%Y %n\" "$path" >> /tmp/fs_10.10.10.10.log done" But the issue is my variable $path is resolving on my localhost where as I want to resolve it on remote host so that it can read file on remote host and take stat of all folder/files listed in "rm_filesystem.log"

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• limits.conf to set memory limits

  - by Rupert Jipe

  I would like to limit any process from using more than 500 MB of RAM. AFAIK this is done using RSS in /etc/security/limits.conf but the process called gnome-panel apparently is using 618436 kB of VmRSS. How can this be ? /etc/security/limits.conf * hard rss 512000 username@debian:~$ cat /proc/3002/status Name: gnome-panel State: S (sleeping) Tgid: 3002 Pid: 3002 PPid: 2910 TracerPid: 0 Uid: 1000 1000 1000 1000 Gid: 1000 1000 1000 1000 FDSize: 64 Groups: 20 24 25 29 44 46 112 116 117 1000 1002 1003 VmPeak: 916636 kB VmSize: 916636 kB VmLck: 0 kB VmHWM: 618436 kB VmRSS: 618436 kB VmData: 601972 kB VmStk: 104 kB VmExe: 516 kB VmLib: 29232 kB VmPTE: 1760 kB Threads: 1 SigQ: 0/14001 SigPnd: 0000000000000000 ShdPnd: 0000000000000000 SigBlk: 0000000000000000 SigIgn: 0000000020001000 SigCgt: 0000000180000000 CapInh: 0000000000000000 CapPrm: 0000000000000000 CapEff: 0000000000000000 CapBnd: ffffffffffffffff Cpus_allowed: 3 Cpus_allowed_list: 0-1 Mems_allowed: 00000000,00000001 Mems_allowed_list: 0 voluntary_ctxt_switches: 871965 nonvoluntary_ctxt_switches: 47553 PaX: PeMRs username@debian:~$ cat /proc/3002/limits Limit Soft Limit Hard Limit Units Max cpu time unlimited unlimited seconds Max file size unlimited unlimited bytes Max data size unlimited unlimited bytes Max stack size 8388608 unlimited bytes Max core file size 0 0 bytes Max resident set 524288000 524288000 bytes Max processes 100 100 processes Max open files 1024 1024 files Max locked memory 65536 65536 bytes Max address space unlimited unlimited bytes Max file locks unlimited unlimited locks Max pending signals 14001 14001 signals Max msgqueue size 819200 819200 bytes Max nice priority 0 0 Max realtime priority 0 0 Max realtime timeout unlimited unlimited us

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• size of extent on LVM2

  - by piotrek

  in LVM1 there was a limit of 65k extends. So size of extent had to been chosen carefully between wasted space on partitions (to big extent) and maximal possible size of logical volume (too small extent). in lvm2 (according to http://docstore.mik.ua/manuals/hp-ux/en/5992-4589/apa.html) the limit is ~16 million extents. so the default size of 4mb gives ~60TB of LV size. so is there any point in making the extent larger than 4-16mb on a desktop? is there any performance degradation or other costs of having big number of extents?

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• Ubuntu log in dialog hot key

  - by bguiz

  Hi, I am having trouble starting up Ubuntu (Karmic). Bascially I get to the bit where the log in dialog is supposed to appear, but it doesn't. Is there a hot key of some sort to force the login dialog to appear? Thanks! Full details here: http://ubuntuforums.org/showthread.php?p=9290145#post9290145

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• Running git-svn with cron results in garbage in .git

  - by Paul

  I've setup a git-svn repo with cron to fetch from the svn repo daily. I have a script to do the fetching, and this is what is invoked by cron. Everything is fine with the repo, and the script works fine when executed manually. However, when it runs under cron, empty files get dropped into the .git directory. The files have names that look like they are some base64 output, e.g. juTrvjP6m8 and kcKf3hu3b4. Two of these files show up for every cron run. I thought these might be commit hashes, but they're not, git-show says it's an unknown revision. I set-up the repo as follows: git svn init http://svn.ip.addr/repo git svn fetch svn-remote My script looks like this: cd /gitsvn/dir git svn fetch svn-remote git svn push pub The last line pushes the repo to a separate (bare) public repo from which others can clone. I'm piping the output from the cron job to a file, which looks like this: fatal: unable to run 'git-svn' Counting objects: 21, done. Delta compression using up to 2 threads. Compressing objects: 100% (10/10), done. Writing objects: 100% (11/11), 59.08 KiB, done. Total 11 (delta 8), reused 0 (delta 0) To /gitpub/repo.git 360faf5..a153b0d trunk -> trunk The line "fatal: unable to run 'git-svn'" is alarming, but the fetch seems to go ahead anyway. Any suggestions? Where are these empty garbage files coming from, and how to stop them? Am I in for bigger problems in the future? BTW, I'm using git 1.6.3.3.

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• How to convert aspell dictionary to simple list of words?

  - by rafalmag

  I want to get list of all words from aspell dictionary. I downloaded aspell and aspell polish dictionary, then unziped it using: preunzip pl.cwl I got pl.wl: ... hippie hippies hippiesowski/bXxYc hippika/MNn hippis/NOqsT hippisiara/MnN hippiska/mMN hippisowski/bXxYc ... but they appear with sufix like /bXxYc or /MNn. These suffixes are defined in pl_affix.dat, which looks like ... SFX n Y 5 SFX n a 0 [^ij]a SFX n ja yj [^aeijoóuy]ja SFX n a 0 [aeijoóuy]ja SFX n ia ij [^drt]ia SFX n ia yj [drt]ia ... It is connected to the declination and conjugation. How can I add to the first list all forms (with all corresponding suffixes as defined in .dat file ) ? BTW: I need this list to spell-checker jazzy.

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• Running commands in parallel with a limit of simultaneous number of commands

  - by Vi

  Sequential: for i in {1..1000}; do do_something $i; done - too slow Parallel: for i in {1..1000}; do do_something $i& done - too much load How to run commands in parallel, but not more than, for example, 20 instances per moment? Now usually using hack like for i in {1..1000}; do do_something $i& sleep 5; done, but this is not a good solution.

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• xinet vs iptables for port forwarding performance

  - by jamie.mccrindle

  I have a requirement to run a Java based web server on port 80. The options are: Web proxy (apache, nginx etc.) xinet iptables setuid The baseline would be running the app using setuid but I'd prefer not to for security reasons. Apache is too slow and nginx doesn't support keep-alives so new connections are made for every proxied request. xinet is easy to set up but creates a new process for every request which I've seen cause problems in a high performance environment. The last option is port forwarding with iptables but I have no experience of how fast it is. Of course, the ideal solution would be to do this on a dedicated hardware firewall / load balancer but that's not an option at present.

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• Is there any way to use the xscreensaver gltext to monitor system information?

  - by Shane

  I am trying to get the X screensaver gltext to monitor my system temp and maybe some other stats. Writing a script that puts together the stats periodically is no problem, but the main thing I'm running into is that gltext doesn't refresh - whatever text I feed it stays there. So, for example, I run this command: $ /usr/lib/xscreensaver/gltext -text "`cat /proc/acpi/thermal_zone/THRM/temperature`" and get a gltext window showing: temperature: 60 C I can manipulate it and format it as necessary, but as my CPU heats up and cools down, it doesn't update, even if I include time variables that do. I have a script that feeds gltext the time as the first line and the temp as the second line - and although the time updates continuously as the time changes, the temperature value remains the same as whenever the screensaver started. Is it possible to do what I want, which is change the text every 60 seconds if the temperature changes?

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• ignore ipv6 router advertisements for static addresses with bonded interfaces

  - by boran

  I need to attribute static IPv6 addresses (not use autoconfigured addresses, and ignore router advertisements). This can be done as follows for a standard interface like eth0 iface eth0 inet6 static address myprefix:mysubnet::myip gateway myprefix:mysubnet::mygatewayip netmask 64 pre-up /sbin/sysctl -q -w net.ipv6.conf.$IFACE.autoconf=0 pre-up /sbin/sysctl -q -w net.ipv6.conf.$IFACE.accept_ra=0 However, how can this be done for bonded interfaces? using the "all" interface does not work. Systems is Ubuntu 10.04, 2.6.24-24-server. If one uses the above sysctl command for the bond0, the networking hangs on boot, because /proc/sys/net/ipv6/conf/bond0 does not yet exist and cannot be written to. One the system has booted /proc/sys/net/ipv6/conf/bond0 exist, so one solution after booting is to add the following to /etc/rc.local: /sbin/sysctl -q -w net.ipv6.conf.bond0.autoconf=0 /sbin/sysctl -q -w net.ipv6.conf.bond0.accept_ra=0 /etc/init.d/networking restart and this has the desired effect, the autoconfig v6 address disappears. Seems like a bit of a hack though, are there better solutions?

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• Virtualized Screen Resolution

  - by Jim R

  I have a 64 bit Ubuntu 9.10 workstation with two virtualized guest OSes using KVM/QEMU. Also both 64-bit. One is Fedora 12 the other is beta of Ubuntu 10.04. The problem is that I would like to use a larger size display that is configured by default. Both guest OSes have a maximum screen resolution of 1024x768. I would like to increase this to something like 1280x900 or 1440x900. The resolution of the host system is 1920x1080. This configuration appears to be a result of the installation detecting the resolution being reported by the virtual screen during installation. The only information I have found on the subject suggests modifying the xorg.conf file in the /etc/X11 directory. Neither guest system has this file. I tried creating one by hand in the Fedora system and managed to render it completely unusable. Not a big deal as this is recently installed and can be reinstalled easily. Is what I want to do possible? If so, how do I accomplish it?

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• Use netcat as a proxy to log traffic

  - by deephacks

  I want to use netcat as a proxy to log http requests and responses to files, then tail these to inspect traffic. Think wireshark. Tried the following where 'fifo' is a named pipe, 'in' and 'out' are files, netcat proxy on port 8080, server on port 8081. while true; do cat fifo | nc -l -p 8080 | tee -a in | nc localhost 8081 | tee -a out 1fifo; done Problems: Netcat stop responing after first request (while loop ignored?). Netcat fails with msg localhost [127.0.0.1] 8081 (tproxy) : Connection refused if server unavailable on 8081. Question: Is it possible to "lazily" connect to 8081 when request is made? I.e. I do not want to have 8081 running when netcat is started.

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• clear smartctl log

  - by MA1

  Is there any way to clear/remove the smartctl test results log?

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• How can I use quotas in samba?

  - by iKarampa

  Hi, I have a simple set-up with just one public share on my configuration file. How can I restrict it's size?

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• "eject" command not working..

  - by shadyabhi

  shadyabhi@shadyabhi-desktop:~$ eject -v eject: using default device `cdrom' eject: device name is `cdrom' eject: expanded name is `/media/cdrom' eject: `/media/cdrom' is a link to `/media/cdrom0' eject: `/media/cdrom0' is not mounted eject: `/media/cdrom0' is not a mount point eject: tried to use `/media/cdrom0' as device name but it is no block device eject: unable to find or open device for: `cdrom' shadyabhi@shadyabhi-desktop:~$ The tray doesnt open.. How do I open tray using command line?

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• Access file by its id and change file attributes

  - by 0xDEAD BEEF

  Just like every file also directories have file id. You can see them by typing ls -i How do I view file content by its id? How do I change directory attribute to file (remove D) and vice versa!

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• file-name encoding problems

  - by tenhouse

  I googled over this topic but couldn't find what I was looking for... the following "happend" to me: I had my files stored on a NTFS-USB Harddisk, because of space problems I moved them to an ext3 system....somehow the filename (content is still ok as far as I saw) encoding screwed up....my files look like the following now: Kküken <--- should have an "ü" Jäger <--- should be an "ä" Zwölf <--- should be an "ö" fünfte <-- should be an "ü" etc .... These are just examples, but already give me my first question Why has the "ü" two different representations? (Maybe I screw up, before I screw up and now I have a mixing of x different encoding-layers? :) ) I tried the following command: convmv -r -f UTF-8 -t ISO-8859-1 * This command work for some files (for example Zwölf) but not for all: iso-8859-1 doesn't cover all needed characters for: "fünfte" So Iguess it must be another encoding - but which? How can I find out this? And is there any way that I can still fix all of this?

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• Serve up PC hard drive as USB mass storage

  - by sheepsimulator

  Is there a software package available that can serve up a hard-drive internal to a PC and make it available over USB to other USB Master nodes as mass storage? Ex: take your C: or /dev/hda drive on a PC (let's call the computer PC-A), and run a driver program which makes your C: or /dev/hda drive available to external devices as USB mass storage. When you'd hook up another PC (PC-B) to PC-A via USB, it would detect a USB mass storage device, which is C: or /dev/hda on PC-A. Is this even possible? EDIT: I know that there are other ways of making data on a drive available between two different computers (eg. putting PC-A's hdd in a USB-drive-enclosure, or having PC-A make the hdd available via a network share). But I'd like to know if the method that I describe above is even technically possible.

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• Configure error when installing php

  - by Emenims

  When installing php I configure it like so: ./configure --prefix=/wwwroot/php --with-apxs2=/wwwroot/bin/apxs --with-configure-file-path=/wwwroot/php --with-mysql --with-gd And a configure error shows up saying this: xml2-config not found. Please check your libxml2 installation. What's this all about? And how settle the problem?

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• Why should krfb use so much cpu when I never use it?

  - by Newton Falls

  I was playing around with KSysGuard and I noticed the process using the most cpu was krfb, which is the server process for desktop sharing. I never use desktop sharing so I suppose it is a default loaded process. Why would this process use so much juice (around 15%) when I never use it and it really shouldn't be doing much of anything? I don't see any network activity so I don't think I am being hacked. I have suspended the process and nothing bad seems to have happened. Can I assume this is a safe thing to do?

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• Independent SharePoint Trainer in DC ~ I conduct, teacher-led SHAREPOINT user training anywhere ~

  - by technical-trainer-pro

  Your options: "*interactive" hands-on VIRTUAL or CLASSROOM style training to all SharePoint Users & Site Admin owners.* I also develop customized classes tailored to the specific design of any SharePoint Site - acting as the translator for those left to understand and use it, on an everyday basis. Audience: users,clients,stakeholders,trainers Areas: functionality,operations,management, user site customization,ITIL training, governance process,change mangement and industry or client specific scenerios. INDIVIDUAL RATE- $300 to join any class *(1)* GROUP RATE - $1500 for a private group of (6-10) Flexible Scheduling contact me : [email protected] Local to DC/MD/VA ---can train hands-on anywhere~

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• Debugging "clogged" TCP connections

  - by Nikratio

  I'm having trouble with an internet connection that seems to randomly "freeze" arbitrary tcp connections. The connections stay established, but no data is coming through. When this happens, netstat still shows the connection status as ESTABLISHED on both the local computer: Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name Timer tcp 0 53 192.168.0.10:41129 173.255.235.238:143 ESTABLISHED 8219/gnutls-cli on (79.31/13/0) ..and the remote server: Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name Timer tcp 0 0 173.255.235.238:143 68.5.174.98:41129 ESTABLISHED 5303/imapd off (0.00/0/0) However, it seems that no data at all is transferred. If I run strace on the local and remote process, both just show a repeating sequence of select calls (with different fds of course), e.g. select(6, [0 5], NULL, NULL, {0, 50000}) = 0 (Timeout) select(6, [0 5], NULL, NULL, {0, 50000}) = 0 (Timeout) select(6, [0 5], NULL, NULL, {0, 50000}) = 0 (Timeout) The internet connection overall does not seem affected, I can still establish new connections to the same service on the same server without any problems. However, the affected local applications seem to be unaware of the problem and just hang. When I look at a packet capture of this connection on the client side, the last thing that happens is that the client transmits some data, then nothing happens for about 1100 seconds, and then several TCP Retransmission requests go out, with intervals increasing from 4 seconds to 130 seconds. No activity is captured after that. After about 10 minutes, the connection on the remote end disappears from the netstat (I wasn't able to catch any intermediate state), but still stays ESTABLISHED on the local end. Finally, after some more minutes, the local application aborts with a timeout and disappears from the local netstat output as well. Does anyone have a suggestion of how I could debug this further to find out where the problem lies and how to fix it? Additionaly and/or as a temporary workaround: is is there some way to globally reduce the timeout on client and/or server to reduce the time before the local application aborts?

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• How to lock screen in linux before hibernating?

  - by Emanuel Ey

  So when i hibernate my laptop the screen doesn't lock automatically. To solve this i've changed /etc/acpi/powerbtn.sh to contain: su - myUsername -c "gnome-screensaver-command -l" sudo pm-hibernate exit 0 When running this file from a command line it works as intended (ie, lock the screen and then hibernate). Unfortunately, when pressing the power button, it still just hibernates without locking the screen -what am I missing? EDIT: I've added the line whoami>>~/Desktop/test.txt to verify which user is executing the /etc/acpi/powerbtn.shscript. When pressing the power button, the file test.txt is created, but is empty. From this i conclude that the script is in fact being called when pressing the power button. What i do not understand is how the output of whoami can be empty...

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